A consistent sleep and wake window
A fixed sleep window beats anything you could buy in a bottle.
Strong consensus“Regularity beats duration in most of the data we have. The body loves to know what time it is.”
Nightly melatonin as a default
Our sources are genuinely split: an occasional tool, or a hormone best left alone.
Genuinely contestedTaken indefinitely at typical retail doses.
Both sides, in their own words
Our sources are genuinely split; here is each case, no referee.
One side
“Melatonin is a timing signal, not a sedative. Used as a nightly sledgehammer it often disappoints, and retail doses are far above what the pineal ever makes.”
a neurologist · podcast episode · 00:58:03
The other
“For the right person, low-dose melatonin timed a few hours before bed is one of the safest tools we have for shifting a late clock.”
a sleep medicine doctor · source video · 00:26:44
In their own words
One faithful sentence per source, linked to the moment it was said; quiet chips mark where money is involved.
a neurologist against
“Most people reaching for it nightly have a light and timing problem that no capsule will solve.”
a neurologist · podcast episode · 00:58:03
a sleep medicine doctor recommend
“Half a milligram, taken early in the evening, can pull a delayed rhythm forward reliably.”
a sleep medicine doctor · source video · 00:26:44
an endocrinologist conditional
“Short courses for jet lag or shift transitions make sense; indefinite use is where I hesitate.”
an endocrinologist · interview · 00:33:29
a pharmacologist PhD against
“Retail products are wildly variable; independent testing keeps finding doses far from the label.”
a pharmacologist PhD · lecture · 00:19:36
Worth discussing with your GP, especially if you take medication or are pregnant. Entrain describes what is publicly taught; it does not prescribe.
More from sleep
A cool bedroom, around 18 degrees
A cool room near 18 degrees deepens the slow-wave sleep that repairs you.
Recommended“Core temperature has to fall for sleep to begin. A cool room simply removes the obstacle.”
Mouth taping at night
An early signal worth watching, once snoring and apnoea are ruled out.
An early signal“Nasal breathing at night is clearly worth encouraging. Whether tape is the right way to get there is a much smaller question than the internet suggests.”